Definition of big-note in English:

big-note

verb

Australian, NZ
  • 1[no object] Display one's wealth ostentatiously:

    ‘I don't want them to think I'm big-noting’
    • ‘He could well have been big-noting among his friends and business associates.’
    • ‘That is what he did—big-noting—and he got caught up in it.’
    • ‘Anyone doubting this only had to have witnessed his outrageous big-noting the night before at a cocktail party.’
    • ‘If you're getting that claustrophobic, painted-into-a-corner feeling, make more room to move by deleting non-essential activities—watching TV, getting cross, big-noting.’
    • ‘She failed to appreciate the dangers inherent in his penchant for big-noting.’
    • ‘He was big-noting for the cameras—as usual.’
    • ‘You live in a world where you big-note and fantasize about what you do.’
    • ‘Their mate, without big-noting, has turned the tables, big time, on the loudmouth.’
    • ‘He doesn't say too much, and he doesn't big-note.’
    • ‘He admitted he had been drinking the night before and may have been big-noting.’
    1. 1.1big-note oneself[with object] Exaggerate one's importance or achievements:
      ‘it was an attempt by a local businessman to big-note himself with the local MP’
      • ‘I hope there is something more here than just big-noting oneself.’
      • ‘I'm getting rather sick of hearing you both big-noting yourselves.’
      • ‘One of his fellow activists accused him of big-noting himself at the expense of illegal aliens.’
      • ‘He was self-effacing, he didn't big-note himself, but he was a gifted musician and was quite good with people.’
      • ‘He tried to brush it off as councillors big-noting themselves by dropping the names of prominent ministers.’
      • ‘We're thinking this dude is not trying to big-note himself, so this must be true.’
      • ‘He wants to take the credit for them so he can big-note himself.’
      • ‘No self-respecting politician would miss the chance these days to big-note themselves at a major extension of a beleaguered railway system.’
      • ‘I miss the good old times of just talking crap, when you'd big-note yourself and I'd scoff quietly to myself.’
      • ‘She swans around the world, big-noting herself to anyone who cares to listen, while her people are dying on hospital waiting lists.’
      brag, crow, swagger, swank, gloat, show off, blow one's own trumpet, sing one's own praises, congratulate oneself, pat oneself on the back
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Origin

1940s: a reference to large-denomination banknotes which, in pre-decimal currency, were also larger in size than the smaller denominations.